export CFLAGS="-O3 -I/opt/tongsuo/include -DOPENSSL_NO_MD4"
export LDFLAGS= "-Wl,-rpath,/opt/tongsuo/lib64"
export LD_LIBRARY_PATH=/opt/tongsuo/lib64:$LD_LIBRARY_PATH
export PKG_CONFIG_PATH=/opt/tongsuo/lib64/pkgconfig:$PKG_CONFIG_PATH
./configure --enable-debug --prefix=/opt/stunnel --with-ssl=/opt/tongsuo
make 
make install
